基于GEE平台的广西地表水时空特征分析

Spatio-temporal Characteristic Analysis of Surface Water in Guangxi Based on GEE Platform

基于GEE平台分析1990—2020年广西主要地表水类型的时空变化特征,基于澄碧河、达开、青狮潭和洪潮江水库等实验区对常见的光谱水体指数(NDWI、MNDWI、AWEI、MBWI、WI2015和TCW)的实用性和稳定性进行分析,挑选适合于广西地区水体信息提取的最优指标,然后将其集成于GEE平台研究广西主要地表水类型的时空变化特征。研究表明AWEI水体指数阈值稳定,有很好的实用性,更适合于广西地区地表水信息提取和长时间序列的监测。1990—2020年各个大型水库地表水的面积变化都不尽相同,面积变化较大,研究成果可为广西水资源动态管理提供科学、客观的基础数据。

Based on the GEE platform, we analyzed the spatio-temporal change characteristics of the main surface water types in Guangxi from 1990 to 2020. We analyzed the practicability and stability of NDWI, MNDWI, AWEI, MBWI, WI2015 and TCW, and selected the optimal index suitable for water body information extraction in Guangxi at first. And then, we integrated into the GEE platform to study the spatio-temporal change characteristics of the main surface water types in Guangxi. The research shows that the threshold value of AWEI water body index is stable, has good practicability, and is more suitable for surface water information extraction and long-term monitoring in Guangxi. From 1990 to 2020, the surface water area of each large-scale reservoir changed differently, and the area change was more drastic. The results can provide scientific and objective basic data for the dynamic management of water resources in Guangxi.